Portable Python script across Python version

commands.getoutput has been move to subprocess module in Python3

Differential Revision: https://reviews.llvm.org/D55205

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@349503 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/scan-view/share/startfile.py b/tools/scan-view/share/startfile.py
index 58023d0..9eb548b 100644
--- a/tools/scan-view/share/startfile.py
+++ b/tools/scan-view/share/startfile.py
@@ -110,7 +110,10 @@
 # Platform support for Unix
 else:
 
-    import commands
+    try:
+        from commands import getoutput
+    except ImportError:
+        from subprocess import getoutput
 
     # @WARNING: use the private API of the webbrowser module
     from webbrowser import _iscommand
@@ -125,7 +128,7 @@
         def detect_kde_version(self):
             kde_version = None
             try:
-                info = commands.getoutput('kde-config --version')
+                info = getoutput('kde-config --version')
 
                 for line in info.splitlines():
                     if line.startswith('KDE'):
@@ -158,7 +161,7 @@
             desktop_environment = 'gnome'
         else:
             try:
-                info = commands.getoutput('xprop -root _DT_SAVE_MODE')
+                info = getoutput('xprop -root _DT_SAVE_MODE')
                 if ' = "xfce4"' in info:
                     desktop_environment = 'xfce'
             except (OSError, RuntimeError):
diff --git a/utils/clangdiag.py b/utils/clangdiag.py
index d449194..a9656c5 100755
--- a/utils/clangdiag.py
+++ b/utils/clangdiag.py
@@ -12,7 +12,6 @@
 from __future__ import print_function
 import lldb
 import argparse
-import commands
 import shlex
 import os
 import re